Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b35fb00b250c7f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 09:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c15245eb1bee5e2714495c8e3635e54 SHA-1: 80a4a4a88e891a0f9b0c0091298fead0ed2809ae SHA-256: 90b35fb00b250c7fa0e9d996b287422069bebccba64c05f2679696564f5c799e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=daftar+hp+android+murah+dibawah+1+juta PDF link annotation
    • http://falegnameriacastiglione.it/userfiles/files/39052042579.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/jukije.pdfIn PDF document text
    • http://rvhifi.cz/files/file/46362025730.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/23177d85f8d2fa70af9ac182cde04adc/rapozunoporib.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f910c40e68---ziditorumilaxeg.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/momekinojelodixugajeg.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/15808811928.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/ligapogom.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/50226605134.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/lojazelewo.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/rafofozoledarig.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/14829364087.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210905185454.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/27oldjknqgimg31tuuf4m7uvg7/pobizuwit.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/meriworebosavulozolo.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/tavupukumodugojup.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/xuvedomubekafisisekazaso.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/tamubisigi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/98968148454.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210915191520.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/toxubesuwovapazuxo.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/23004471040.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/benonuziwodajanepixesilu.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/11695511311.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/24259427456.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 17112 bytes
SHA-256: d6d9142160accfee14cc0176830f3c8c703a22757ee8cd4594b6d91570b55b63
font_01_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 10924 bytes
SHA-256: a4cc1eef188cdfc2aa322625c67412b011285670462af9a275ff3b8fbb5df40b
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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